1109309818 has 4 divisors (see below), whose sum is σ = 1663964730. Its totient is φ = 554654908.

The previous prime is 1109309801. The next prime is 1109309819. The reversal of 1109309818 is 8189039011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8189039011 = 42467 ⋅192833.

It can be written as a sum of positive squares in only one way, i.e., 601573729 + 507736089 = 24527^2 + 22533^2 .

It is a super-2 number, since 2×1109309818² = 2461136544622386248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1109309819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277327453 + ... + 277327456.

Almost surely, 2^1109309818 is an apocalyptic number.

1109309818 is a deficient number, since it is larger than the sum of its proper divisors (554654912).

1109309818 is an equidigital number, since it uses as much as digits as its factorization.

1109309818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554654911.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1109309818 is about 33306.3029770643. The cubic root of 1109309818 is about 1035.1841622707.

The spelling of 1109309818 in words is "one billion, one hundred nine million, three hundred nine thousand, eight hundred eighteen".